A common scenario is to let swagger-php generate a definition based on your model class.
These definitions can then be referenced with `ref="#/components/schemas/$classname"
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'UsingRefs\Model' not found in /home/evanore/public_html/evatrack/vendor/zircote/swagger-php/Examples/using-refs/Product.php:14
Stack trace:
#0 {main}
  thrown in <b>/home/evanore/public_html/evatrack/vendor/zircote/swagger-php/Examples/using-refs/Product.php</b> on line <b>14</b><br />